log rotation for /var/log

Question

I got an alert that the root directory is running out of space. On inspection using ncdu i found that the /var/log folder was taking alot space. Then further inspection shows that syslog and kern.log are the ones taking too much space. So i tailed the logs for both and found out that they are being written constantly and too fast and my issue is that the log information on each line is similar to an extent that for over 300 lines i manually inspected the log info is

Sep 10 00:50:02 amsabots kernel: [ 2421.158588] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.158645] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.158703] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.158738] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.164080] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.164226] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.164266] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.164324] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.164384] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.164443] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.164503] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.164545] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.164583] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.164688] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.164782] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.164842] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.164900] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.164960] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.165020] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.165078] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.165138] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.165175] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.170990] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.171140] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.171188] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.171290] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.171338] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.171381] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.171500] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.171646] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.171739] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.171799] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.171858] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.171917] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.171976] dpc 0000:00:1d.0:pcie010: DPC containment event, status:0x1f00 source:0x0000
Sep 10 00:50:02 amsabots kernel: [ 2421.172033] dpc 0000:00:1^C

I have gone through multiple solutions on how to fix this but none seem to really provide a solution. My suggestion which i would like further clarifications are as follows:

Provide a file size limit to something like 1gb to /etc/logrotate.d/rsyslog - This will limit the log file size for all syslog to 1gb then be rotated if it goes past
Set the logrotate for kern.log and auth.log to daily and reduce the number of rotated files to 2. for both sysylog, kern.log and auth.log

/var/log/syslog
{
    rotate 7
    daily
    missingok
    notifempty
    delaycompress
    compress
    postrotate
        /usr/lib/rsyslog/rsyslog-rotate
    endscript
}

/var/log/mail.info
/var/log/mail.warn
/var/log/mail.err
/var/log/mail.log
/var/log/daemon.log
/var/log/kern.log
/var/log/auth.log
/var/log/user.log
/var/log/lpr.log
/var/log/cron.log
/var/log/debug
/var/log/messages
{
    rotate 4
    weekly
    missingok
    notifempty
    compress
    delaycompress
    sharedscripts
    postrotate
        /usr/lib/rsyslog/rsyslog-rotate
    endscript
}

Any advice on the impact of the changes i have listed above

There is no need to post screenshots of terminal windows to show some text output. Copy paste the text itself, it is much quicker, and makes it more readable. — mikewhatever, Sep 9, 2021 at 20:26
Summarize the logs. Count the columns (I could have if you'd posted text, not an image) and use cut -c45- to chop off the changing information (up to the time since boot in square brackets (# is a digit) "[######.######] ", pipe the results into ` | sort | uniq -c | sort -rn | tee saved.txt | less`. Fix the the problem. Stop the deluge! — waltinator, Sep 9, 2021 at 21:41
Also please post the version of Ubuntu and the output of lshw and uname -a. If you google the "DPC containment event" it seems to indicate it could be a BIOS bug. — Wayne Vosberg, Sep 10, 2021 at 0:33
Figure out how to stop the "DPC containment event". This is the problem, not the logs filling up. Don't treat the symptoms. — Organic Marble, Sep 10, 2021 at 4:00
@mikewhatever i have edited the question to reflect your suggestions — Andrew Mititi, Sep 10, 2021 at 7:57

lnee · Accepted Answer · 2021-09-10 01:32:41Z

0

First install stacer next: open stacer and goto "system cleaner" and click on "Select All" then blue butten above it. then click on "Select All" then blue butten. type in your password and your done.

answered Sep 10, 2021 at 1:32

lnee

7964 silver badges21 bronze badges

Stacer did the job very well. Thanks
– Andrew Mititi
Sep 13, 2021 at 20:40

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